Sleep regression?

Laura

Hi all. My LO is 15 1/2 weeks. For the past few days, night time sleep has been a serious struggle. Before she was sleeping 8:30pm until 6am, sometimes even 7:30 am. Now she is waking at 1:30, 2:30, 4:30, 6:30. And she’s HUNGRY even though she is eating a ton during the day! I am struggling. Is this the sleep regression?? We took taking Cara babies courses, the newborn course and 3-4 months and I have been implementing those things (mostly, don’t feed right away for night wakings, make sure wake windows are adequate for age, etc) but it does not seem to be working anymore. Any thoughts or suggestions? Isn’t it kinda early to be the sleep regression? Mama needs sleep!!! TIA